JPH04351646A - Production of preexpanded particle - Google Patents
Production of preexpanded particleInfo
- Publication number
- JPH04351646A JPH04351646A JP12614391A JP12614391A JPH04351646A JP H04351646 A JPH04351646 A JP H04351646A JP 12614391 A JP12614391 A JP 12614391A JP 12614391 A JP12614391 A JP 12614391A JP H04351646 A JPH04351646 A JP H04351646A
- Authority
- JP
- Japan
- Prior art keywords
- polymer particles
- particles
- inorganic gas
- foaming
- temperature
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 239000002245 particle Substances 0.000 title claims abstract description 110
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 15
- 229920000642 polymer Polymers 0.000 claims abstract description 65
- 229910001872 inorganic gas Inorganic materials 0.000 claims abstract description 38
- 239000004604 Blowing Agent Substances 0.000 claims abstract description 15
- 238000010438 heat treatment Methods 0.000 claims abstract description 11
- 229920005990 polystyrene resin Polymers 0.000 claims abstract description 5
- 239000012808 vapor phase Substances 0.000 claims abstract 2
- 238000005187 foaming Methods 0.000 claims description 43
- 238000005470 impregnation Methods 0.000 claims description 19
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 14
- 238000000034 method Methods 0.000 claims description 12
- 239000000463 material Substances 0.000 claims description 8
- 238000000465 moulding Methods 0.000 claims description 5
- 230000007423 decrease Effects 0.000 abstract description 4
- 230000004927 fusion Effects 0.000 abstract description 4
- 238000003912 environmental pollution Methods 0.000 abstract description 2
- 239000012774 insulation material Substances 0.000 abstract description 2
- -1 polyethylene Polymers 0.000 description 19
- 229920005989 resin Polymers 0.000 description 18
- 239000011347 resin Substances 0.000 description 18
- 239000007789 gas Substances 0.000 description 15
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 8
- 239000004793 Polystyrene Substances 0.000 description 7
- 229920002223 polystyrene Polymers 0.000 description 7
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 6
- PPBRXRYQALVLMV-UHFFFAOYSA-N Styrene Chemical compound C=CC1=CC=CC=C1 PPBRXRYQALVLMV-UHFFFAOYSA-N 0.000 description 6
- 238000004581 coalescence Methods 0.000 description 6
- 230000000052 comparative effect Effects 0.000 description 6
- 235000014113 dietary fatty acids Nutrition 0.000 description 6
- 239000000194 fatty acid Substances 0.000 description 6
- 229930195729 fatty acid Natural products 0.000 description 6
- 239000012298 atmosphere Substances 0.000 description 5
- 229920001577 copolymer Polymers 0.000 description 5
- 150000004665 fatty acids Chemical class 0.000 description 5
- 239000006260 foam Substances 0.000 description 5
- 229920000573 polyethylene Polymers 0.000 description 5
- MYRTYDVEIRVNKP-UHFFFAOYSA-N 1,2-Divinylbenzene Chemical compound C=CC1=CC=CC=C1C=C MYRTYDVEIRVNKP-UHFFFAOYSA-N 0.000 description 4
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 4
- 239000004698 Polyethylene Substances 0.000 description 4
- 239000001569 carbon dioxide Substances 0.000 description 4
- 229910002092 carbon dioxide Inorganic materials 0.000 description 4
- 239000006185 dispersion Substances 0.000 description 4
- 239000004721 Polyphenylene oxide Substances 0.000 description 3
- YXFVVABEGXRONW-UHFFFAOYSA-N Toluene Chemical compound CC1=CC=CC=C1 YXFVVABEGXRONW-UHFFFAOYSA-N 0.000 description 3
- 239000000654 additive Substances 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000009776 industrial production Methods 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 229920001155 polypropylene Polymers 0.000 description 3
- 238000003756 stirring Methods 0.000 description 3
- 239000012756 surface treatment agent Substances 0.000 description 3
- 239000001993 wax Substances 0.000 description 3
- RTZKZFJDLAIYFH-UHFFFAOYSA-N Diethyl ether Chemical compound CCOCC RTZKZFJDLAIYFH-UHFFFAOYSA-N 0.000 description 2
- YNQLUTRBYVCPMQ-UHFFFAOYSA-N Ethylbenzene Chemical compound CCC1=CC=CC=C1 YNQLUTRBYVCPMQ-UHFFFAOYSA-N 0.000 description 2
- PEDCQBHIVMGVHV-UHFFFAOYSA-N Glycerol Natural products OCC(O)CO PEDCQBHIVMGVHV-UHFFFAOYSA-N 0.000 description 2
- 239000004743 Polypropylene Substances 0.000 description 2
- ATUOYWHBWRKTHZ-UHFFFAOYSA-N Propane Chemical compound CCC ATUOYWHBWRKTHZ-UHFFFAOYSA-N 0.000 description 2
- 229910000019 calcium carbonate Inorganic materials 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 2
- 229910001873 dinitrogen Inorganic materials 0.000 description 2
- 239000002612 dispersion medium Substances 0.000 description 2
- 235000011187 glycerol Nutrition 0.000 description 2
- NNPPMTNAJDCUHE-UHFFFAOYSA-N isobutane Chemical compound CC(C)C NNPPMTNAJDCUHE-UHFFFAOYSA-N 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 229910052757 nitrogen Inorganic materials 0.000 description 2
- 239000012188 paraffin wax Substances 0.000 description 2
- 229920005672 polyolefin resin Polymers 0.000 description 2
- 229920006380 polyphenylene oxide Polymers 0.000 description 2
- 239000002904 solvent Substances 0.000 description 2
- JHPBZFOKBAGZBL-UHFFFAOYSA-N (3-hydroxy-2,2,4-trimethylpentyl) 2-methylprop-2-enoate Chemical compound CC(C)C(O)C(C)(C)COC(=O)C(C)=C JHPBZFOKBAGZBL-UHFFFAOYSA-N 0.000 description 1
- BTXXTMOWISPQSJ-UHFFFAOYSA-N 4,4,4-trifluorobutan-2-one Chemical compound CC(=O)CC(F)(F)F BTXXTMOWISPQSJ-UHFFFAOYSA-N 0.000 description 1
- BQACOLQNOUYJCE-FYZZASKESA-N Abietic acid Natural products CC(C)C1=CC2=CC[C@]3(C)[C@](C)(CCC[C@@]3(C)C(=O)O)[C@H]2CC1 BQACOLQNOUYJCE-FYZZASKESA-N 0.000 description 1
- RSWGJHLUYNHPMX-UHFFFAOYSA-N Abietic-Saeure Natural products C12CCC(C(C)C)=CC2=CCC2C1(C)CCCC2(C)C(O)=O RSWGJHLUYNHPMX-UHFFFAOYSA-N 0.000 description 1
- NIXOWILDQLNWCW-UHFFFAOYSA-M Acrylate Chemical compound [O-]C(=O)C=C NIXOWILDQLNWCW-UHFFFAOYSA-M 0.000 description 1
- WKBOTKDWSSQWDR-UHFFFAOYSA-N Bromine atom Chemical compound [Br] WKBOTKDWSSQWDR-UHFFFAOYSA-N 0.000 description 1
- XDTMQSROBMDMFD-UHFFFAOYSA-N Cyclohexane Chemical compound C1CCCCC1 XDTMQSROBMDMFD-UHFFFAOYSA-N 0.000 description 1
- VGGSQFUCUMXWEO-UHFFFAOYSA-N Ethene Chemical compound C=C VGGSQFUCUMXWEO-UHFFFAOYSA-N 0.000 description 1
- 239000005977 Ethylene Substances 0.000 description 1
- VVQNEPGJFQJSBK-UHFFFAOYSA-N Methyl methacrylate Chemical compound COC(=O)C(C)=C VVQNEPGJFQJSBK-UHFFFAOYSA-N 0.000 description 1
- 229920001890 Novodur Polymers 0.000 description 1
- CBENFWSGALASAD-UHFFFAOYSA-N Ozone Chemical compound [O-][O+]=O CBENFWSGALASAD-UHFFFAOYSA-N 0.000 description 1
- 229920003171 Poly (ethylene oxide) Polymers 0.000 description 1
- OFOBLEOULBTSOW-UHFFFAOYSA-N Propanedioic acid Natural products OC(=O)CC(O)=O OFOBLEOULBTSOW-UHFFFAOYSA-N 0.000 description 1
- 239000003490 Thiodipropionic acid Substances 0.000 description 1
- 238000003915 air pollution Methods 0.000 description 1
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- 239000010775 animal oil Substances 0.000 description 1
- 239000002216 antistatic agent Substances 0.000 description 1
- 125000003118 aryl group Chemical group 0.000 description 1
- GDTBXPJZTBHREO-UHFFFAOYSA-N bromine Substances BrBr GDTBXPJZTBHREO-UHFFFAOYSA-N 0.000 description 1
- 229910052794 bromium Inorganic materials 0.000 description 1
- PJSDPKGKXZOTCP-UHFFFAOYSA-N butane pentane Chemical compound CCCC.CCCCC.CCCCC PJSDPKGKXZOTCP-UHFFFAOYSA-N 0.000 description 1
- 239000003240 coconut oil Substances 0.000 description 1
- 235000019864 coconut oil Nutrition 0.000 description 1
- 239000000084 colloidal system Substances 0.000 description 1
- 239000003086 colorant Substances 0.000 description 1
- 229920006037 cross link polymer Polymers 0.000 description 1
- 239000003431 cross linking reagent Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- UMNKXPULIDJLSU-UHFFFAOYSA-N dichlorofluoromethane Chemical compound FC(Cl)Cl UMNKXPULIDJLSU-UHFFFAOYSA-N 0.000 description 1
- 229940099364 dichlorofluoromethane Drugs 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 239000002270 dispersing agent Substances 0.000 description 1
- 239000008157 edible vegetable oil Substances 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- PFBWBEXCUGKYKO-UHFFFAOYSA-N ethene;n-octadecyloctadecan-1-amine Chemical compound C=C.CCCCCCCCCCCCCCCCCCNCCCCCCCCCCCCCCCCCC PFBWBEXCUGKYKO-UHFFFAOYSA-N 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 239000010419 fine particle Substances 0.000 description 1
- 239000004088 foaming agent Substances 0.000 description 1
- 230000001771 impaired effect Effects 0.000 description 1
- 239000000314 lubricant Substances 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
- 239000011976 maleic acid Substances 0.000 description 1
- FPYJFEHAWHCUMM-UHFFFAOYSA-N maleic anhydride Chemical compound O=C1OC(=O)C=C1 FPYJFEHAWHCUMM-UHFFFAOYSA-N 0.000 description 1
- 239000002609 medium Substances 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- FTQWRYSLUYAIRQ-UHFFFAOYSA-N n-[(octadecanoylamino)methyl]octadecanamide Chemical compound CCCCCCCCCCCCCCCCCC(=O)NCNC(=O)CCCCCCCCCCCCCCCCC FTQWRYSLUYAIRQ-UHFFFAOYSA-N 0.000 description 1
- RKISUIUJZGSLEV-UHFFFAOYSA-N n-[2-(octadecanoylamino)ethyl]octadecanamide Chemical compound CCCCCCCCCCCCCCCCCC(=O)NCCNC(=O)CCCCCCCCCCCCCCCCC RKISUIUJZGSLEV-UHFFFAOYSA-N 0.000 description 1
- IJDNQMDRQITEOD-UHFFFAOYSA-N n-butane Chemical compound CCCC IJDNQMDRQITEOD-UHFFFAOYSA-N 0.000 description 1
- 239000002736 nonionic surfactant Substances 0.000 description 1
- 239000003921 oil Substances 0.000 description 1
- 235000019198 oils Nutrition 0.000 description 1
- 238000004806 packaging method and process Methods 0.000 description 1
- 229920002285 poly(styrene-co-acrylonitrile) Polymers 0.000 description 1
- 229920000570 polyether Polymers 0.000 description 1
- 239000002952 polymeric resin Substances 0.000 description 1
- 229920001296 polysiloxane Polymers 0.000 description 1
- 239000001294 propane Substances 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 239000002002 slurry Substances 0.000 description 1
- 239000000344 soap Substances 0.000 description 1
- 239000003549 soybean oil Substances 0.000 description 1
- 235000012424 soybean oil Nutrition 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000004381 surface treatment Methods 0.000 description 1
- 229920003002 synthetic resin Polymers 0.000 description 1
- 239000000454 talc Substances 0.000 description 1
- 229910052623 talc Inorganic materials 0.000 description 1
- 229920005992 thermoplastic resin Polymers 0.000 description 1
- 235000019303 thiodipropionic acid Nutrition 0.000 description 1
- 229960002447 thiram Drugs 0.000 description 1
- 231100000331 toxic Toxicity 0.000 description 1
- 230000002588 toxic effect Effects 0.000 description 1
- VZCYOOQTPOCHFL-UHFFFAOYSA-N trans-butenedioic acid Natural products OC(=O)C=CC(O)=O VZCYOOQTPOCHFL-UHFFFAOYSA-N 0.000 description 1
- UFTFJSFQGQCHQW-UHFFFAOYSA-N triformin Chemical compound O=COCC(OC=O)COC=O UFTFJSFQGQCHQW-UHFFFAOYSA-N 0.000 description 1
- 235000015112 vegetable and seed oil Nutrition 0.000 description 1
- 239000008158 vegetable oil Substances 0.000 description 1
- XOOUIPVCVHRTMJ-UHFFFAOYSA-L zinc stearate Chemical compound [Zn+2].CCCCCCCCCCCCCCCCCC([O-])=O.CCCCCCCCCCCCCCCCCC([O-])=O XOOUIPVCVHRTMJ-UHFFFAOYSA-L 0.000 description 1
Landscapes
- Manufacture Of Porous Articles, And Recovery And Treatment Of Waste Products (AREA)
Abstract
Description
【０００１】0001
【産業上の利用分野】本発明は、予備発泡粒子の製造方
法に関する。この方法により製造された予備発泡粒子は
、水蒸気孔を有する金型に充填し、水蒸気加熱してこの
予備発泡粒子を相互に融着させて断熱材 包装緩衝材
等の製品を製造するのに有用なものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing pre-expanded particles. The pre-expanded particles produced by this method are filled into a mold with steam holes and heated with steam to fuse the pre-expanded particles to each other, which is useful for manufacturing products such as insulation materials, packaging cushioning materials, etc. It is something.
【０００２】0002
【従来の技術】従来よりポリスチレンを主体に熱可塑性
樹脂発泡体粒子を金型成形して各種発泡体製品を得る方
法は広く行われている。この発泡樹脂粒子を得るのに、
スチレン系樹脂の場合、まず、ブタン ペンタン等の
揮発性有機発泡剤を分散剤を有する水分散媒体系で樹脂
の軟化点以上の温度で当発泡剤の蒸気圧下で樹脂粒子に
含浸し、冷却して取り出し、脱水乾燥 薬剤等で表面
処理 熟成して発泡性樹脂粒子に製造している。次い
でこの原料を水蒸気の大気圧もしくは０．２ｋｇ／ｃｍ
２ Ｇまでの加圧下で発泡して発泡樹脂粒子が得られ、
これは通常予備発泡粒子と呼ばれている。このようにし
て得られた予備発泡粒子は、所定の発泡槽内に導入され
上記のごとく水蒸気加熱して各種発泡成形品を提供する
ために用いられる。2. Description of the Related Art Conventionally, methods have been widely used to obtain various foam products by molding thermoplastic resin foam particles, mainly made of polystyrene. To obtain these expanded resin particles,
In the case of styrenic resins, first, a volatile organic blowing agent such as butane pentane is impregnated into resin particles in an aqueous dispersion medium containing a dispersant at a temperature above the softening point of the resin under the vapor pressure of the blowing agent, and then cooled. The resin is then taken out, dehydrated, dried, surface treated with chemicals, etc., and aged to produce foamable resin particles. This raw material is then subjected to atmospheric pressure of water vapor or 0.2 kg/cm
Foamed resin particles are obtained by foaming under pressure up to 2 G,
This is commonly referred to as pre-expanded particles. The pre-expanded particles thus obtained are introduced into a predetermined foaming tank, heated with steam as described above, and used to provide various foamed molded products.
【０００３】一方 ポリエチレン ポリプロピレン
等のポリオレフィン系樹脂の場合、ブタンジクロロフロ
ロメタン等の揮発性有機発泡剤を水分散系で樹脂の軟化
点以上の温度で含浸させた後、当発泡剤の蒸気圧下を保
持しながら容器水面下の一端を開放し 内圧より低圧
の雰囲気に放出することによって予備発泡粒子を得てい
る。On the other hand, in the case of polyolefin resins such as polyethylene and polypropylene, a volatile organic blowing agent such as butane dichlorofluoromethane is impregnated in an aqueous dispersion system at a temperature higher than the softening point of the resin, and then the blowing agent is heated under the vapor pressure. Pre-expanded particles are obtained by opening one end of the container below the water surface and releasing the container into an atmosphere with a lower pressure than the internal pressure.
【０００４】このように、従来の予備発泡粒子の一般的
な製造方法においては、発泡剤としては専ら、揮発性有
機発泡剤が採用されており、かつその含浸も主として水
分散系において行なわれていた。[0004] As described above, in the conventional general manufacturing method of pre-expanded particles, a volatile organic blowing agent is exclusively used as a blowing agent, and impregnation thereof is mainly carried out in an aqueous dispersion system. Ta.
【０００５】しかしながら、上記の揮発性有機発泡剤は
樹脂基材に対し親和性もあり、保持製に優れ 発泡剤
としても効能よい反面、含浸時及び予備発泡時において
良溶媒として作用して樹脂粒子相互の合着を発生させ易
い等の難点をもっている。またあるものは毒性や可燃性
のため危険性を有し、あるものは高価であり、しかも殆
どの場合、大気に放出することになるのでオゾン層の破
壊、光化学スモッグ等大気汚染の問題を生じるものであ
った。However, while the above volatile organic blowing agents have an affinity for the resin base material and are excellent in retention and are effective as blowing agents, they also act as good solvents during impregnation and pre-foaming, causing resin particles to deteriorate. It has drawbacks such as the tendency for mutual coalescence to occur. Also, some are toxic or flammable and therefore dangerous, others are expensive, and in most cases they are released into the atmosphere, causing air pollution problems such as depletion of the ozone layer and photochemical smog. It was something.
【０００６】そこで最近、上記揮発性発泡剤に代えて、
例えば炭酸ガス、窒素ガス、空気等の無機ガスを予備発
泡粒子の工業生産に適用する提案もなされている。例え
ば、特公昭６２−６１２２７号公報には、ポリオレフィ
ン系樹脂を密閉容器内に水系に分散させ次いで無機ガス
を供給し無機ガスの蒸気圧を保持しながら樹脂の軟化温
度以上に加温した後、該温度圧力で含浸して水面下の吐
出口を開放し低圧の雰囲気に放出して予備発泡粒子を製
造する方法を開示している。また、特開昭６０−２４５
６４８号公報には、樹脂粒子を軟化温度以上に加熱する
際に分散媒として大量の水も同時に加熱することから大
量の熱エネルギーを要する欠点を克服すべく樹脂粒子融
着防止剤を用いて相互に分離させた状態で無機ガス状媒
体に於て高温高圧域から放出させる製法を開示している
。[0006] Recently, instead of the above volatile blowing agent,
For example, proposals have been made to apply inorganic gases such as carbon dioxide gas, nitrogen gas, and air to the industrial production of pre-expanded particles. For example, Japanese Patent Publication No. 62-61227 discloses that a polyolefin resin is dispersed in an aqueous system in a closed container, then an inorganic gas is supplied, and the vapor pressure of the inorganic gas is maintained while being heated to a temperature higher than the softening temperature of the resin. A method is disclosed for manufacturing pre-expanded particles by impregnating the particles at the temperature and pressure, opening a discharge port below the water surface, and releasing the particles into a low-pressure atmosphere. Also, JP-A-60-245
Publication No. 648 discloses that in order to overcome the disadvantage that a large amount of heat energy is required because a large amount of water is also simultaneously heated as a dispersion medium when resin particles are heated to a temperature higher than their softening temperature, a resin particle anti-fusing agent is used to prevent mutual fusion. This disclosure discloses a manufacturing method in which the separated components are released from a high temperature and high pressure region in an inorganic gaseous medium.
【０００７】[0007]
【発明が解決しようとする課題】しかしながら無機ガス
を用いた前記方法においては、放出時に樹脂軟化温度以
上に加温するので含浸系全体の攪拌が必要となり樹脂粒
子相互の融着・合着の恐れがあり、器壁 攪拌羽根等
にスケール付着する欠点をもっている。そして、さらに
、いずれも瞬時に発泡がなされる放出発泡法であるので
、発泡倍率の制御が困難で得られた予備発泡粒子の発泡
倍率の均一性に劣り、しかも放出初期と後期の密閉容器
内圧変動に対する安定化対策も必要となる問題があった
。[Problems to be Solved by the Invention] However, in the above method using an inorganic gas, since the temperature is heated above the resin softening temperature at the time of discharge, stirring of the entire impregnation system is required, and there is a risk of fusion and coalescence of resin particles with each other. However, it has the disadvantage of scale adhesion to the vessel walls, stirring blades, etc. Furthermore, since both of them are discharge foaming methods that foam instantaneously, it is difficult to control the foaming ratio, resulting in poor uniformity in the foaming ratio of the obtained pre-expanded particles. There was also a problem that required stabilization measures against fluctuations.
【０００８】本発明は、かかる状況下なされたものであ
り、ことに重合体樹脂間の融着・合着によるトラブルを
招くことなく、無機ガスを使用して発泡倍率の均一な高
品質予備発泡粒子を効率良く生産できる方法を提供しよ
うとするものである。The present invention was made under such circumstances, and provides high-quality pre-foaming with a uniform expansion ratio using an inorganic gas without causing troubles due to fusion/coalescence between polymer resins. The aim is to provide a method that can efficiently produce particles.
【０００９】[0009]
【課題を解決するための手段】かくして本発明によれば
重合体粒子に発泡剤としての無機ガスを含浸させた後、
この発泡性重合体粒子を発泡槽内で加熱発泡条件に付し
て成形用予備発泡粒子を得ることからなり、上記無機ガ
スの含浸を、重合体粒子が合着しない緩和な温度下でか
つ加圧下において該重合体粒子に無機ガスを気相含浸さ
せることにより行なうことにより、無機ガス含有量が０
．０５モル／ｋｇ（重合体粒子）以上の発泡性重合体粒
子とし、これを無機ガス含有量が０．０５モル／ｋｇ（
重合体粒子）未満に減少する迄に発泡槽に導入し、該重
合体粒子のビカット軟化点より１０〜４０℃高い加熱温
度下で水蒸気導入により加熱発泡させて予備発泡粒子を
得ることを特徴とする予備発泡粒子の製造方法が提供さ
れる。[Means for Solving the Problems] According to the present invention, after impregnating polymer particles with an inorganic gas as a blowing agent,
These expandable polymer particles are subjected to heating and foaming conditions in a foaming tank to obtain pre-expanded particles for molding. By impregnating the polymer particles with an inorganic gas in a gas phase under pressure, the inorganic gas content can be reduced to 0.
．． 0.05 mol/kg (polymer particles) or more of foamable polymer particles with an inorganic gas content of 0.05 mol/kg (polymer particles) or more.
The polymer particles are introduced into a foaming tank until the polymer particles are reduced to less than 10% of the polymer particles, and heated and foamed by introducing water vapor at a heating temperature 10 to 40°C higher than the Vicat softening point of the polymer particles to obtain pre-expanded particles. A method for producing pre-expanded particles is provided.
【００１０】本発明は、前記目的を達成すべく重合体粒
子への無機ガスの含浸を従来のごとき水分散系ではなく
気相下でかつ特定の条件下で行ない、かつ放出発泡によ
らずに予備発泡を行なうという手段を講じたものである
。In order to achieve the above object, the present invention impregnates polymer particles with an inorganic gas in a gas phase rather than in a conventional aqueous dispersion system and under specific conditions, and does not require release foaming. This method takes the form of pre-foaming.
【００１１】そして、本発明は、かかる手段により高品
質の予備発泡粒子、ことに発泡倍数３０倍以上の高発泡
予備発泡粒子が効率良く得られるという事実の発見に基
づくものである。The present invention is based on the discovery that high-quality pre-expanded particles, particularly highly expanded pre-expanded particles with an expansion ratio of 30 times or more, can be efficiently obtained by such means.
【００１２】この発明に用いる重合体粒子としては、粒
径約０．２〜３．０ｍｍのものが適しており、また、そ
の基材樹脂としては、ポリスチレン系樹脂が適している
。このポリスチレン系樹脂の具体例としては、ポリスチ
レン、ポリメチルスチレン、スチレン−アクリロニトリ
ル共重合体、スチレン−アクリロニトリル−ブタジエン
共重合体、スチレンとアクリル酸エステルもしくはメタ
クリル酸エステルとの共重合体、スチレン−無水マレイ
ン酸共重合体、スチレン重合体とエチレンもしくはプロ
ピレン重合体の架橋樹脂又はスチレン重合体とポリフェ
ニレンオキサイドの混合樹脂が挙げられる。[0012] The polymer particles used in this invention are suitably those having a particle size of about 0.2 to 3.0 mm, and the base resin thereof is suitably a polystyrene resin. Specific examples of this polystyrene resin include polystyrene, polymethylstyrene, styrene-acrylonitrile copolymer, styrene-acrylonitrile-butadiene copolymer, copolymer of styrene and acrylic ester or methacrylic ester, and styrene-anhydride. Examples include maleic acid copolymers, crosslinked resins of styrene polymers and ethylene or propylene polymers, and mixed resins of styrene polymers and polyphenylene oxide.
【００１３】これらのポリスチレン系樹脂は、発泡性や
発泡時の気泡の均一性等の点で、ジビニルベンゼン、多
官能（メタ）アクリレート等の架橋剤で適度に部分架橋
されたものであってよい。[0013] These polystyrene resins may be appropriately partially crosslinked with a crosslinking agent such as divinylbenzene or polyfunctional (meth)acrylate in terms of foamability and uniformity of cells during foaming. .
【００１４】かかる重合体粒子に無機ガスを含浸するに
際し、これらの粒子表面には適当な表面処理剤による処
理がなされていてもよく、また、粒子基材中に、適当な
添加剤が含まれていてもよい。これらの表面処理剤や添
加剤の例としては、滑剤、帯電防止剤、発泡助剤、着色
剤等が挙げられる。これらのうち、表面処理剤としては
、タルク、炭酸カルシウム、シリカ アルミナのコロ
イド及びスラリー、エチレンビスステアロアミド、高級
脂肪酸、高級脂肪酸アルコール、ヤシ油 大豆油等の
食用油、水添硬化油、高級脂肪酸トリグリセライド、ソ
ルビタンステアリルエステル、グリセリンステアリルエ
ステル、グリセリンアルキルエーテル、ポリエーテル、
ポリオキシエチレンアルキルフェノールエーテル、ヒド
ロキシカルボン酸エステル、融点４０−１２０℃のパラ
フィン及びポリエチレンワックス、ジンクステアレート
等の金属石鹸、変性ポリシロキサン等が挙げられる。[0014] When impregnating such polymer particles with an inorganic gas, the surfaces of these particles may be treated with a suitable surface treatment agent, and the particle base material may contain suitable additives. You can leave it there. Examples of these surface treatment agents and additives include lubricants, antistatic agents, foaming aids, colorants, and the like. Among these, surface treatment agents include talc, calcium carbonate, silica-alumina colloids and slurries, ethylene bisstearamide, higher fatty acids, higher fatty acid alcohols, edible oils such as coconut oil and soybean oil, hydrogenated hydrogenated oils, and high-grade Fatty acid triglyceride, sorbitan stearyl ester, glycerin stearyl ester, glycerin alkyl ether, polyether,
Examples include polyoxyethylene alkylphenol ether, hydroxycarboxylic acid ester, paraffin and polyethylene wax with a melting point of 40 to 120°C, metal soaps such as zinc stearate, and modified polysiloxane.
【００１５】また、添加剤としては、チオジプロピオン
酸エステル、チウラム化合物、高級脂肪酸アマイド、芳
香族ビスアマイド、エチレンビスステアリルアマイド、
高級脂肪酸、高級脂肪酸金属塩、パラフィン、ワックス
、ポリエチレンポリプロピレンワックス、不溶性微細粒
異質ポリマー、動植物硬化油、非イオン界面活性剤、１
．３ジエン臭素重合体等や、発泡助剤として知られたト
ルエン、エチルベンゼン、シクロヘキサン等（但し、含
有量は０． ３−２．０ｗｔ％程度）が挙げられる。[0015]Additives include thiodipropionic acid ester, thiuram compound, higher fatty acid amide, aromatic bisamide, ethylene bisstearylamide,
Higher fatty acids, higher fatty acid metal salts, paraffin, wax, polyethylene polypropylene wax, insoluble fine particle heterogeneous polymer, hydrogenated animal and vegetable oils, nonionic surfactants, 1
．． Examples include 3-diene bromine polymer, etc., and toluene, ethylbenzene, cyclohexane, etc., which are known as foaming aids (however, the content is about 0.3-2.0 wt%).
【００１６】なお、かかる表面処理や内添は、前もって
リボンブレンダータンブラー、ナウターミキサー、スパ
ーミキサー、レーディゲミキサー等で行なうのが望まし
く、または無機ガス含浸容器が回転もしくは攪拌できる
ものであれば含浸時に同時に行ってもよい。[0016] It is preferable that such surface treatment and internal addition be carried out in advance using a ribbon blender tumbler, Nauta mixer, Spar mixer, Loedige mixer, etc., or if the inorganic gas impregnated container can be rotated or stirred. This may be done at the same time as impregnation.
【００１７】本発明において、まず上記重合体粒子は気
相加圧下で無機ガス（炭酸ガス、窒素ガス、空気等）の
含浸処理に付される。In the present invention, the polymer particles are first impregnated with an inorganic gas (carbon dioxide, nitrogen gas, air, etc.) under pressure in the gas phase.
【００１８】従って、含浸処理は、密閉容器内で無機ガ
スを圧入して行なわれる。かかる含浸処理において系内
ことに重合体粒子の温度は緩和温度とされる。ここで緩
和な温度とは、含浸処理中に重合体粒子間が合着しない
温度を意味し、具体的には重合体粒子のビカット軟化点
よりもすくなくとも１０℃低い温度下とされる。好まし
い温度は、樹脂基材のみならず、用いる無機ガスの種類
にも依存する。[0018] Therefore, the impregnation treatment is carried out by injecting an inorganic gas under pressure into a closed container. In such an impregnation treatment, the temperature of the system, particularly of the polymer particles, is brought to a relaxation temperature. The mild temperature here means a temperature at which polymer particles do not coalesce during the impregnation process, and specifically, a temperature that is at least 10° C. lower than the Vicat softening point of the polymer particles. The preferred temperature depends not only on the resin base material but also on the type of inorganic gas used.
【００１９】通常、ガス含浸性、容器の耐圧性などの点
でより低温が望ましく、４０℃以下が好ましい。また０
℃以下は工業的にエネルギー消費大となる。工業的に安
定して高い発泡性を得る場合、炭酸ガスは好ましくは５
−４０℃であり、窒素及び空気は０〜３０℃である。な
お、重合体のビカット軟化点より１０℃低い温度以上で
は含浸時に重合体粒子が合着し当製造法が実施できなく
なり、またガス含浸量が減少し希望する発泡性が得られ
ない。Generally, a lower temperature is desirable from the viewpoint of gas impregnation properties, pressure resistance of the container, etc., and a temperature of 40° C. or lower is preferable. 0 again
Below ℃, industrial energy consumption becomes large. In order to obtain industrially stable and high foaming properties, carbon dioxide is preferably 5
-40°C, nitrogen and air between 0 and 30°C. Note that if the temperature exceeds 10° C. lower than the Vicat softening point of the polymer, the polymer particles will coalesce during impregnation, making it impossible to carry out this production method, and the amount of gas impregnated will decrease, making it impossible to obtain the desired foamability.
【００２０】かかる条件においては、無機ガスの重合体
への溶媒性がなく、加熱も殆どなされないことから含浸
時の重合体粒子相互の合着等の惧れはない。従って、重
合体粒子を静置した状態で含浸を行ってもよい。また含
浸の促進及び均一性を得るために無機ガス加圧下で重合
体粒子を容器上部よりポンプ等により吸引して調温室を
通し下部にもどし循環させてもよい。Under these conditions, since the inorganic gas has no solvent properties for the polymer and little heating is performed, there is no fear that the polymer particles will coalesce with each other during impregnation. Therefore, impregnation may be performed while the polymer particles are left standing. Further, in order to promote impregnation and obtain uniformity, the polymer particles may be sucked from the upper part of the container by a pump or the like under pressure of an inorganic gas, and returned to the lower part through a controlled chamber and circulated.
【００２１】また、重合体粒子に炭酸ガスを含浸させる
適当な圧力は１５ｋｇ／ｃｍ２ 以上、好ましくは２０
ｋｇ／ｃｍ２ 以上、５０ｋｇ／ｃｍ２ 以下であり、
窒素及び空気を含浸させる適当な圧力は３０ｋｇ／ｃｍ
２ 以上、好ましくは４５ｋｇ／ｃｍ２ 以上、９０ｋ
ｇ／ｃｍ２ 以下である。[0021] The appropriate pressure for impregnating the polymer particles with carbon dioxide gas is 15 kg/cm2 or more, preferably 20 kg/cm2 or more.
kg/cm2 or more and 50 kg/cm2 or less,
The appropriate pressure for impregnating nitrogen and air is 30kg/cm
2 or more, preferably 45kg/cm2 or more, 90k
g/cm2 or less.
【００２２】かかる含浸処理により、重合体粒子に無機
ガスが均一に含浸される。この含浸時間は、無機ガスの
種類、圧力、重合体粒子の基材、粒径によっても異なる
が、少なくとも無機ガスが０．０５モル／ｋｇ（重合体
粒子）以上含浸されるまで行われ、通常、１〜１０時間
の含浸処理で達成される。とくに、高発泡の予備発泡粒
子を得るためには、無機ガスの含浸量を０．５〜４．０
モル／ｋｇ（重合体粒子）とするのが好ましい。By this impregnation treatment, the polymer particles are uniformly impregnated with the inorganic gas. This impregnation time varies depending on the type of inorganic gas, the pressure, the base material of the polymer particles, and the particle size, but it is carried out until at least 0.05 mol/kg (polymer particles) or more of the inorganic gas is impregnated. , achieved with an impregnation treatment of 1 to 10 hours. In particular, in order to obtain highly foamed pre-expanded particles, the amount of inorganic gas impregnated should be 0.5 to 4.0.
It is preferably mol/kg (polymer particles).
【００２３】なお、本発明は無機ガスを使用するもので
あり、その目的からしても揮発性有機発泡剤を使用する
必要はない。しかしながら、本発明の効果が阻害されな
い限り、若干の揮発性有機発泡剤を併用することも可能
であり、例えば、プロパン、ｎ−ブタン、ｉ−ブタン、
ジクロロフルオロメタン等を５ｗｔ％以下の少量併用し
ても同様な効果を得ることが可能である。[0023] The present invention uses an inorganic gas, and it is not necessary to use a volatile organic blowing agent in view of its purpose. However, as long as the effects of the present invention are not impaired, it is also possible to use some volatile organic blowing agents in combination, such as propane, n-butane, i-butane,
A similar effect can be obtained by using dichlorofluoromethane or the like in a small amount of 5 wt% or less.
【００２４】このようにして、無機ガスが含浸された重
合体粒子は、次いで予備発泡条件に付される。この際、
重要なことは重合体粒子中の無機ガス含有量が０．０５
モル／ｋｇ（重合体粒子）以上の条件で予備発泡を行な
うことである。すなわち、無機ガス含浸重合体粒子は、
含浸密閉容器から大気へ取り出すとその無機ガスが徐々
に大気へ逸散してその含有量が低下し、０．０５モル／
ｋｇ未満になると均一な発泡倍率の予備発泡粒子を生産
することが困難となる。The polymer particles thus impregnated with an inorganic gas are then subjected to prefoaming conditions. On this occasion,
The important thing is that the inorganic gas content in the polymer particles is 0.05
Pre-foaming is carried out under conditions of mol/kg (polymer particles) or higher. That is, the inorganic gas-impregnated polymer particles are
When taken out from the impregnated sealed container to the atmosphere, the inorganic gas gradually dissipates into the atmosphere and its content decreases to 0.05 mol/
If the weight is less than 1 kg, it becomes difficult to produce pre-expanded particles with a uniform expansion ratio.
【００２５】従って、工業生産上は、含浸処理後加圧状
態を保ったまま予備発泡用の発泡槽に導入して加熱発泡
を行なうのが好ましく、一旦大気へ取り出した後に予備
発泡に供する場合には、無機ガス含有量が０．０５モル
／ｋｇ未満に低下する迄に発泡槽へ導入して加熱発泡さ
せる必要がある。これらの態様は、状況に応じて適宜選
択されるが、いずれも本発明の範囲内である。Therefore, in terms of industrial production, it is preferable to heat and foam the material by introducing it into a foaming tank for pre-foaming while maintaining the pressurized state after the impregnation treatment. must be introduced into a foaming tank and heated and foamed until the inorganic gas content decreases to less than 0.05 mol/kg. These aspects are appropriately selected depending on the situation, but all are within the scope of the present invention.
【００２６】予備発泡は、発泡槽内で加熱水蒸気を導入
することにより行なわれる。かかる水蒸気としては、６
０−１００℃の露点を有する水蒸気又は水蒸気−空気混
合気体を用いるのが適しており、とくに後者の混合気体
としては、７０−１００℃の露点を有するものが好まし
い。なお、露点６０℃未満のものでは、高倍率発泡体を
得難く好ましくない。Pre-foaming is carried out by introducing heated steam into the foaming tank. As such water vapor, 6
It is suitable to use water vapor or a water vapor-air mixture having a dew point of 0-100°C, with the latter gas mixture preferably having a dew point of 70-100°C. If the dew point is less than 60° C., it is difficult to obtain a high-magnification foam, which is not preferable.
【００２７】予備発泡時の系の加熱は主として上記加熱
水蒸気によって行なわれ、重合体粒子がそのビカット軟
化点よりも１０〜４０℃高い温度となるように制御され
、好ましくは１５〜３５℃高い温度とされる。この温度
が重合体のビカット軟化点より１０℃高い温度に満たな
い場合は発泡が遅くなり、無機ガスの外部逸散が優位と
なって発泡効果が充分に得られず、その結果高発泡性が
得られない。また、重合体のビカット軟化点より４０℃
以上高い温度では発泡適正幅が極く狭くなり工業的に正
常な予備発泡粒子が得られない。[0027] Heating of the system during pre-foaming is carried out mainly by the above-mentioned heated steam, and is controlled so that the temperature of the polymer particles is 10 to 40°C higher than the Vicat softening point, preferably 15 to 35°C higher. It is said that If this temperature is less than 10°C higher than the Vicat softening point of the polymer, foaming will be slow and the external dissipation of inorganic gas will become predominant, making it impossible to obtain a sufficient foaming effect, resulting in high foaming properties. I can't get it. Also, 40°C below the Vicat softening point of the polymer.
If the temperature is higher than this, the appropriate foaming width becomes extremely narrow, and industrially normal pre-expanded particles cannot be obtained.
【００２８】なお、かかる予備発泡時において発泡槽内
を予め発泡温度付近に予熱しておくか、または発泡温度
範囲にある加熱気体圧下に発泡性重合体粒子を供給する
ことが、良好な発泡性の維持の点で好ましく、通常、０
．５〜２．０ｋｇ／ｃｍ２ Ｇ程度の加圧下に保ってお
くのが適している。さらに、加熱の均一性の点で、重合
体粒子を攪拌して行なうのが好ましい。[0028] In order to obtain good foaming properties, it is recommended to preheat the inside of the foaming tank to around the foaming temperature or to supply the foamable polymer particles under a heated gas pressure within the foaming temperature range at the time of pre-foaming. It is preferable in terms of maintaining 0, and usually 0
．． It is suitable to keep it under pressure of about 5 to 2.0 kg/cm2 G. Furthermore, from the viewpoint of uniform heating, it is preferable to stir the polymer particles.
【００２９】更に、発泡槽へ水蒸気等の加熱気体を初期
供給時、加圧下の圧力を保持しながら発泡槽の一部を開
けて、重合体粒子の充填時に共に導入されうる空気、無
機発泡剤を排出して温度の上昇、熱回りを良くすること
もできる。Furthermore, when initially supplying heated gas such as water vapor to the foaming tank, a part of the foaming tank is opened while maintaining the pressure, and air and an inorganic foaming agent can be introduced together when filling the polymer particles. It is also possible to raise the temperature and improve heat circulation by discharging the gas.
【００３０】このようにして得られた予備発泡粒子は、
公知手法によりいわゆる型内成形に付されて種々の形状
の成形品を得る材料として用いられる。The pre-expanded particles thus obtained are:
It is used as a material to obtain molded products of various shapes by being subjected to so-called in-mold molding by a known method.
【００３１】[0031]
【実施例】以下、本発明を実施例を用いて説明するが、
これにより本発明は限定されるものではない。[Examples] The present invention will be explained below using Examples.
The present invention is not limited thereby.
【００３２】３００ｍｌのガス含浸容器に発泡時合着防
止材（アビエチン酸で表面処理された炭酸カルシュウム
）０．４ｇで表面被履処理した種々のポリスチレン系重
合体粒子１５０ｇを入れてて密閉し、無機ガスを圧入し
内容物を調温しながら一定時間保持した後、直接加熱気
体圧下の予備発泡用発泡槽に充填するか もしくは内
圧を取り除き短時間（約３０分）のうちに発泡槽に投入
し、加圧された加熱気体中で加熱発泡し予備発泡粒を得
た。これら予備発泡粒は水蒸気穴を有する金形に充填し
て水蒸気加圧下で加熱発泡すれば正常な発泡成形品が得
られるものであった。A 300 ml gas-impregnated container was charged with 150 g of various polystyrene polymer particles whose surface was coated with 0.4 g of a foaming anti-coalescence agent (calcium carbonate surface-treated with abietic acid), and the container was sealed. After injecting inorganic gas and holding the contents for a certain period of time while controlling the temperature, either directly fill the foaming tank under heated gas pressure for pre-foaming, or remove the internal pressure and put it into the foaming tank within a short time (about 30 minutes). Then, the mixture was heated and foamed in a pressurized heated gas to obtain pre-expanded grains. If these pre-expanded particles were filled into a mold having steam holes and heated and foamed under steam pressure, a normal foamed molded product could be obtained.
【００３３】以下、用いた処理温度、処理圧力等の条件
と得られた予備発泡粒子の特性、性状についての結果を
比較例と共に表１〜２に示した。[0033] Below, the results regarding the conditions such as the treatment temperature and treatment pressure used and the characteristics and properties of the obtained pre-expanded particles are shown in Tables 1 and 2 together with comparative examples.
【００３４】なお、用いた重合体は、実施例１〜６及び
１１、比較例１〜５については各々市販の成形用ポリス
チレン（平均分子量Ｍｗ３０００００）であり、実施例
７は無水マレイン酸（８％）−スチレン（９２％）共重
合体（Ｍｗ３６００００）実施例８はメチルメタクリレ
ート（７０％）−イソブチルメタクリレート（２０％）
−α−メチルスチレン（１０％）共重合体（Ｍｗ３００
０００）、実施例９はポリエチレン（３０％）−ポリス
チレン（７０％）架橋重合体、実施例１０はジビニルベ
ンゼン（０．０３％）架橋ポリスチレン、実施例１２は
ポリフェニレンオキサイド（２０％）−ポリスチレン（
８０％）混合重合体である。The polymers used in Examples 1 to 6 and 11 and Comparative Examples 1 to 5 were commercially available molding polystyrene (average molecular weight Mw 300,000), and in Example 7, maleic anhydride (8% )-Styrene (92%) copolymer (Mw360000) Example 8 is methyl methacrylate (70%)-isobutyl methacrylate (20%)
-α-methylstyrene (10%) copolymer (Mw300
000), Example 9 is a polyethylene (30%)-polystyrene (70%) crosslinked polymer, Example 10 is a divinylbenzene (0.03%) crosslinked polystyrene, and Example 12 is a polyphenylene oxide (20%)-polystyrene (
80%) mixed polymer.
【表１】[Table 1]
【表２】[Table 2]
【表３】[Table 3]
【００３５】なお、実施例１〜１２の予備発泡粒子は、
いずれも工程中、合着等は生じず、かつ気泡が均一で高
品質のものであった。これに対し比較例１の予備発泡粒
子では、ガス含浸時に合着が生じ、比較例２及び４では
、予備発泡粒子の発泡倍率が不充分であり、比較例３で
は気泡が不均一であり、比較例５では独立気泡率が７０
％以下と実用に供し得ず、いずれも予備発泡粒子の品質
が劣るものであった。[0035] The pre-expanded particles of Examples 1 to 12 were as follows:
In all cases, no coalescence occurred during the process, and the bubbles were uniform and of high quality. On the other hand, in the pre-expanded particles of Comparative Example 1, coalescence occurred during gas impregnation, in Comparative Examples 2 and 4, the expansion ratio of the pre-expanded particles was insufficient, and in Comparative Example 3, the bubbles were non-uniform. In Comparative Example 5, the closed cell ratio was 70.
% or less, they could not be put to practical use, and the quality of the pre-expanded particles was poor in both cases.
【００３６】[0036]
【発明の効果】本発明の予備発泡粒子の製造方法によれ
ば、無機ガスを用いて気泡が均一で高発泡倍率の予備発
泡粒子を効率的良く製造することができる。従って、従
来の無機ガス使用の放出発泡法で見られるような品質上
の欠点が大幅に改善されると共に、水分散系を用いるこ
となくかつガス含浸時に特に加熱する必要がないため製
造工程上も有利である。そしてその結果、好ましい作業
環境下でかつ環境汚染を引き起こすことなく、予備発泡
粒子の工業生産が可能となる。According to the method for producing pre-expanded particles of the present invention, pre-expanded particles with uniform bubbles and a high expansion ratio can be efficiently produced using an inorganic gas. Therefore, the quality defects seen in the conventional discharge foaming method using inorganic gas are greatly improved, and the manufacturing process is also improved because no water dispersion system is used and there is no need for special heating during gas impregnation. It's advantageous. As a result, industrial production of pre-expanded particles becomes possible under favorable working conditions and without causing environmental pollution.
Claims (4)
を含浸させた後、この発泡性重合体粒子を発泡槽内で加
熱発泡条件に付して成形用予備発泡粒子を得ることから
なり、上記無機ガスの含浸を、重合体粒子が合着しない
緩和な温度下でかつ加圧下において該重合体粒子に無機
ガスを気相含浸させることにより行なうことにより、無
機ガス含有量が０．０５モル／ｋｇ（重合体粒子）以上
の発泡性重合体粒子とし、これを無機ガス含有量が０．
０５モル／ｋｇ（重合体粒子）未満に減少する迄に発泡
槽に導入し、該重合体粒子のビカット軟化点より１０〜
４０℃高い加熱温度下で水蒸気導入により加熱発泡させ
て予備発泡粒子を得ることを特徴とする予備発泡粒子の
製造方法。1. The method comprises impregnating polymer particles with an inorganic gas as a blowing agent, and then subjecting the expandable polymer particles to heating and foaming conditions in a foaming tank to obtain pre-expanded particles for molding, The inorganic gas content can be reduced to 0.05 mol by impregnating the polymer particles with the inorganic gas in a vapor phase under pressure and at a mild temperature where the polymer particles do not coalesce. /kg (polymer particles) or more of expandable polymer particles, and the inorganic gas content is 0.
05 mol/kg (polymer particles) into the foaming tank until the polymer particles are reduced to less than 10 to 10 mol/kg (polymer particles) from the Vicat softening point of the polymer particles.
A method for producing pre-expanded particles, which comprises heating and foaming the particles by introducing water vapor at a heating temperature 40° C. higher to obtain pre-expanded particles.
樹脂である請求項１の製造方法。2. The manufacturing method according to claim 1, wherein the base material of the polymer particles is a polystyrene resin.
緩和な温度がその重合体粒子のビカット軟化点より１０
℃以上低い温度域である請求項１の製造方法。3. The moderate temperature at which the polymer particles do not coalesce during gas impregnation is 10° below the Vicat softening point of the polymer particles.
The manufacturing method according to claim 1, wherein the temperature range is lower than or equal to .degree.
点を有しかつ重合体粒子のビカット軟化点より１０〜４
０℃高い温度の水蒸気又は水蒸気−空気混合気体を用い
て行なわれる請求項１の製造方法。4. The introduction of water vapor has a dew point of 60 to 100°C and 10 to 4°C below the Vicat softening point of the polymer particles.
The manufacturing method according to claim 1, which is carried out using water vapor or a water vapor-air mixed gas at a temperature 0°C higher.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12614391A JPH07113070B2 (en) | 1991-05-29 | 1991-05-29 | Method for producing pre-expanded particles |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12614391A JPH07113070B2 (en) | 1991-05-29 | 1991-05-29 | Method for producing pre-expanded particles |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH04351646A true JPH04351646A (en) | 1992-12-07 |
| JPH07113070B2 JPH07113070B2 (en) | 1995-12-06 |
Family
ID=14927742
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP12614391A Expired - Fee Related JPH07113070B2 (en) | 1991-05-29 | 1991-05-29 | Method for producing pre-expanded particles |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH07113070B2 (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH06269515A (en) * | 1993-03-18 | 1994-09-27 | Sekisui Plastics Co Ltd | Golf club head and its manufacture |
| WO2010113874A1 (en) | 2009-03-30 | 2010-10-07 | 積水化成品工業株式会社 | Expandable polystyrene resin particles and process for producing same |
| JP2012201861A (en) * | 2011-03-28 | 2012-10-22 | Sekisui Plastics Co Ltd | Pre-expanded resin particle comprising polypropylene resin, manufacturing method for the same and expansion-molded product |
| WO2018061263A1 (en) * | 2016-09-27 | 2018-04-05 | 積水化成品工業株式会社 | Expanded beads, molded foam, fiber-reinforced composite, and automotive component |
-
1991
- 1991-05-29 JP JP12614391A patent/JPH07113070B2/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH06269515A (en) * | 1993-03-18 | 1994-09-27 | Sekisui Plastics Co Ltd | Golf club head and its manufacture |
| WO2010113874A1 (en) | 2009-03-30 | 2010-10-07 | 積水化成品工業株式会社 | Expandable polystyrene resin particles and process for producing same |
| US9079342B2 (en) | 2009-03-30 | 2015-07-14 | Sekisui Plastics Co., Ltd. | Expandable polystyrene resin particles and method for producing the same |
| JP2012201861A (en) * | 2011-03-28 | 2012-10-22 | Sekisui Plastics Co Ltd | Pre-expanded resin particle comprising polypropylene resin, manufacturing method for the same and expansion-molded product |
| WO2018061263A1 (en) * | 2016-09-27 | 2018-04-05 | 積水化成品工業株式会社 | Expanded beads, molded foam, fiber-reinforced composite, and automotive component |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH07113070B2 (en) | 1995-12-06 |
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